Low current drain operational transconductance amplifier

Details Low current drain operational transconductance amplifier Low current drain operational transconductance amplifier

1995-08-24

1997-01-28

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330253, 330254, 330257, 330260, H03F 345

Patent

active

055981291

ABSTRACT:
An operational transconductance amplifier (500) includes an input stage (502) having a first and second amplifiers (504, 508) driving class-AB, push-pull amplifiers (506, 510). The input stage (502) receives a differential input signal at first and second amplifier inputs (528, 540). The push-pull amplifiers (506, 510) establish differential currents in a transconductance-setting resistor (512), thereby eliminating the need for static current sources. The biasing levels established by the first and second amplifiers (504, 508) to drive the push-pull amplifiers (506, 510) also control a current source (514). Currents from the current source (514) are summed and provided to amplifier outputs (594, 596).

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Hogervost et al., "FA 14.1: A Compact Power-Efficient 3V CMOS Rail-to-Rail Input/Output Operational Amplifier for VLSI Cell Libraries", IEEE International Solid-State Circuits Conference, 1994, pp. 244-245.
Willingham et al., "A BiCMOS Low-Distortion 8-Mhz Low-Pass Filter", IEEE Journal of Solid-State Circuits, vol. 28, No. 12, pp. 1234-1245, Dec. 1993 .

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